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Cheap flights from Chicago (CHI) to Seattle (BFI)

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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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Cheap flights from Chicago to Seattle in December 2025 , January 2026

24 Dec - 15 Jan $ 908.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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26 Dec - 15 Jan $ 910.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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24 Dec - 16 Jan $ 948.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
CHI
Chicago
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Last minute flights from Chicago to Seattle

24 Dec - 01 Jan $ 1,079.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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26 Dec - 01 Jan $ 1,080.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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23 Dec - 01 Jan $ 1,163.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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One-way flights to Seattle from Chicago

7:44 PM - 5:35 AM
Air Excursions
2 Stops
36h 41m
CHI - BFI
$ 519
Kiwi
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7:44 PM - 7:35 AM
Air Excursions
2 Stops
38h 41m
CHI - BFI
$ 520
Kiwi
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11:29 AM - 5:25 PM
Air Excursions
2 Stops
32h 46m
CHI - BFI
$ 602
Kiwi
Pick dates

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

Related info for your journey
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.